diff options
| -rw-r--r-- | src/server/Buffer.cpp | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/src/server/Buffer.cpp b/src/server/Buffer.cpp index 6d605490..a91ce1b8 100644 --- a/src/server/Buffer.cpp +++ b/src/server/Buffer.cpp @@ -162,17 +162,25 @@ Buffer::port_data(PortType port_type) const const_cast<Buffer*>(this)->port_data(port_type)); } +/** Vector fabsf */ +static inline __m128 +mm_abs_ps(__m128 x) +{ + const __m128 sign_mask = _mm_set1_ps(-0.0f); // -0.0f = 1 << 31 + return _mm_andnot_ps(sign_mask, x); +} + float Buffer::peak(const Context& context) const { #ifdef __SSE__ const __m128* const vbuf = (const __m128* const)samples(); - __m128 vpeak = vbuf[0]; + __m128 vpeak = mm_abs_ps(vbuf[0]); const SampleCount nblocks = context.nframes() / 4; - // First, find the vector max of the buffer + // First, find the vector absolute max of the buffer for (SampleCount i = 1; i < nblocks; ++i) { - vpeak = _mm_max_ps(vpeak, vbuf[i]); + vpeak = _mm_max_ps(vpeak, mm_abs_ps(vbuf[i])); } // Now we need the single max of vpeak @@ -199,7 +207,7 @@ Buffer::peak(const Context& context) const const Sample* const buf = samples(); float peak = 0.0f; for (SampleCount i = 0; i < context.nframes(); ++i) { - peak = fmaxf(peak, buf[i]); + peak = fmaxf(peak, fabsf(buf[i])); } return peak; #endif |